77 lines
2.0 KiB
JavaScript
77 lines
2.0 KiB
JavaScript
/**
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* Copyright (c) 2013-present, Facebook, Inc.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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'use strict';
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var PluginError = require('plugin-error');
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var through = require('through2');
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var fs = require('fs');
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var path = require('path');
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var PM_REGEXP = require('./shared/provides-module').regexp;
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var PLUGIN_NAME = 'module-map';
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module.exports = function(opts) {
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// Assume file is a string for now
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if (!opts || !('moduleMapFile' in opts && 'prefix' in opts)) {
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throw new PluginError(
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PLUGIN_NAME,
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'Missing options. Ensure you pass an object with `moduleMapFile` and `prefix`'
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);
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}
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var moduleMapFile = opts.moduleMapFile;
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var prefix = opts.prefix;
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var moduleMap = {};
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function transform(file, enc, cb) {
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if (file.isNull()) {
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cb(null, file);
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return;
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}
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if (file.isStream()) {
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cb(new PluginError('module-map', 'Streaming not supported'));
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return;
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}
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// Get the @providesModule piece of out the file and save that.
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var matches = file.contents.toString().match(PM_REGEXP);
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if (matches) {
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var name = matches[1];
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if (moduleMap.hasOwnProperty(name)) {
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this.emit(
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'error',
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new PluginError(
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PLUGIN_NAME,
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'Duplicate module found: ' + name + ' at ' + file.path + ' and ' +
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moduleMap[name]
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)
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);
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}
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moduleMap[name] = file.path;
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}
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this.push(file);
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cb();
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}
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function flush(cb) {
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// Keep it ABC order for better diffing.
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var map = Object.keys(moduleMap).sort().reduce(function(prev, curr) {
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// Rewrite path here since we don't need the full path anymore.
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prev[curr] = prefix + path.basename(moduleMap[curr], '.js');
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return prev;
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}, {});
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fs.writeFile(moduleMapFile, JSON.stringify(map, null, 2), 'utf-8', function() {
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// avoid calling cb with fs.write callback data
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cb();
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});
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}
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return through.obj(transform, flush);
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};
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